How have we dealt with a Notice of Appeal and Appointed Counsel requesting to review the record independently?

Defendants filed timely notices of appeal and we appointed counsel to represent them. Appointed counsel filed briefs in which they raised no issues and asked us to asked us to review the record independently under People v. Wende (1979) 25 Cal.3d 436. We notified defendants that their attorneys had filed briefs that raised no issues and that they could submit by brief or letter any grounds for an appeal, or contentions or arguments they wished this court to consider. To date, we have not received a response from either defendant.